EPA-M*** POWER AMPLIFIER FOR OPEN LOOP PROPORTIONAL VALVES SERIES 20

89 220/101 ED EPA-M*** POWER AMPLIFIER FOR OPEN LOOP PROPORTIONAL VALVES EPA-M1** single solenoid EPA-M2** double solenoid EPA-M3** 2 independent channels single solenoid valves RAIL MOUNTING TYPES: DIN EN 50022 FUNCTIONAL BLOCK DIAGRAM EPA-M1** FUNCTIONAL BLOCK DIAGRAM EPA-M2** SPECIFICATIONS Power supply Required power VDC 10 30 Ripple included see par. 2.1 FUNCTIONAL BLOCK DIAGRAM EPA-M3** Output current Power supply electrical protections Output electrical protections Reference signal Input reference signal impedance Electromagnetic compatibility (EMC) - EMISSIONS EN 50081-1 - IMMUNITY EN 50082-1 (see par. 4 - note 1) Housing material Housing dimensions Connector see par. 1 and 6 overload polarity inversion Short circuit See par. 2.3 kω 100 in compliance with 89/336 EEC thermoplastic polyamid mm 120 x 93 x 23 Plug-in terminal block with tightening screws; 15 poles Operating temperature range C -15 +70 Mass kg 0,15 89 220/101 ED 1/8

1 - IDENTIFICATION CODE E P A - M / 20 Power amplifier Modular version for rail mounting type DIN EN 50022 Versions: 1 = for single solenoid proportional valves 2 = for double solenoid proportional valves 3 = 2 channels for an independent control of two single solenoid proportional valves Series No. (from 20 to 29 sizes and mounting dimensions remain unchanged) Switching frequency: 0 = 200 Hz 1 = 100 Hz 4 = 400 Hz Maximum current: 1 = 800 ma 3 = 1600 ma 2 = 1200 ma 4 = 2000 ma EPA-M *** is a power amplifier controlling open loop proportional valves. It is designed for rail mounting types: DIN EN 50022. The unit supplies a variable current in proportion to the reference signal and independently of temperature variations or load impedence. The PWM stage on the solenoid power supply makes it possible to reduce the valve hysteresis thus optimising control precision. The front panel is fitted with potentiometers to ensure maximum precision (see paras. 3 and 5). The card is available in three different main versions to control single solenoid valves, double solenoid valves and valves with two independent channels controlling two single solenoid valves. Each version is available with different maximum current sizes and switching frequencies (PWM), optimized according to the valve to be controlled (see par. 6). VERSION EPA-M1 ** 2 - FUNCTIONAL SPECIFICATIONS 2.1 - Electric power supply The card requires a power supply of between 10 and 30 VDC (terminals 1 and 2). NOTE: The value of the power supply voltage on the card must not be lower than the rated working voltage of the solenoid to be controlled. The power supply voltage must be rectified and filtered, with maximum admissible ripple within the above voltage range. The power required by the card depends on the power supply voltage and on the maximum value of the supplied current (it is determined by the card version). In general a conservative value of the required power can be considered as the product of V x I. Example: a card with a maximum current = 800 ma and a power supply voltage of 24 Vcc requires a power of about 20W. In case of a card with a maximum current =1600 ma and a power supply voltage of 24 Vcc the used power is equal to 38.5W. VERSION EPA-M2 ** VERSION EPA-M3 ** 2.2 - Electrical protection The card is protected against overvoltage and polarity inversion. On the output a protection against any short circuit is foreseen. 2.3 - Reference signal The card accepts voltage reference signals from an external generator (PLC,CNC) or from a potentiometer power supplied by the card itself. The value of the reference voltage depends on the card version as stated in the diagrams along side. See par. 10 for the electric connections referring to the different card versions. 89 220/101 ED 2/8

3 -SIGNALS AND ADJUSTMENT 3.1 - POWER ON (Power supply) The green LED indicates the card power supply: ON - normal power supply OFF - no power supply 3.2 - RAMP (Ramp regulation) The RAMP potentiometer regulates the time required to reach the current according to a step change of the reference signal. Regulation is the same for increases or decreases in the reference signal. The JP2 jumper inside the card permits to select two different ramp time regulation ranges: - JP2 jumper open (default condition) = adjustable time from 0,02 to 5 sec. - JP2 jumper closed = adjustable time from 0,02 to 1 sec. This makes it possible to control the valve response and adapt it to the requirements of the hydraulic system and the machine cycles. Rotate clockwise to increase ramp time. NOTE: In the version EPA-M3 ** with two channels the ramp function is active only on channel 1. 3.3 - GAIN A / GAIN B (Scale factor regulation) GAIN A and GAIN B potentiometers enable regulation of the ratio between the set reference value and the maximum current supplied by the card. Therefore an independent regulation of the controlled parameters for each of the valve hydraulic configurations is possible. - VERSION EPA-M1 ** Only the GAIN A potentiometer is active - VERSION EPA-M2 ** The GAIN A and GAIN B potentiometers act respectively on the current supplied to the solenoids A and B of the controlled proportional valve. - VERSION EPA-M3 ** The GAIN A and GAIN B potentiometers act respectively on the current supplied by the channels 1 and 2 of the card. For all versions the setting range goes from 0 to 100% of the full scale value. Multiturn potentiometer - Rotate clockwise to increase current. NOTE: The card maximum current is limited by the LIMIT A and LIMIT B potentiometers according to the card version (see par. 3.6). See par. 6 for the default value. 3.4 - OFFSET A / OFFSET B (Offset current regulation) The OFFSET A and OFFSET B potentiometers enable the regulation of the offset current. They are used to eliminate the valve insensitivity zone (dead zone). - VERSION EPA-M1 ** Only the OFFSET A potentiometer is active. The offset current becomes active when the reference signal is higher than +150 mv. - VERSION EPA-M2 ** The OFFSET A and OFFSET B potentiometers act respectively on the offset current of the solenoids A and B of the controlled proportional valve. The offset current becomes active when the reference signal is higher than ± 150 mv. - VERSION EPA-M3 ** The OFFSET A and OFFSET B potentiometers act respectively on the offset current of the channels 1 and 2. On each single channel the offset current becomes active when the reference signal is higher than +150 mv. For all versions the setting range goes from 0 to 60% of the full scale value. Multiturn potentiometer - Rotate clockwise to increase current. With a value lower than the stated threshold, the offset is not active. Only a polarization current equal to 50 ma is active. NOTE: The offset current can be added to or subtracted from the full scale value. A change in the setting of the offset current causes therefore a change in the current set with the GAIN potentiometer. 3.5 - SWITCHING (PWM frequency adjustment) This potentiometer adjusts the switching frequency (PWM). The setting range goes from 50 to 400 Hz. An appropriate switching frequency adjustment allows a reduction of the valve hysteresis value. Single turn potentiometer - Rotate clockwise to increase frequency. NOTE: The potentiometer setting is sealed with a red coating and it must never be adjusted by the user. 3.6 - LIMIT A / LIMIT B The setting of these two potentiometers states the maximum current supplied by the card. Different settings of the current maximum value refer to different card versions - see par. 6. NOTE: The potentiometer setting is sealed with a red coating and it must never be adjusted by the user. 89 220/101 ED 3/8

4 - INSTALLATION The card is designed for rail mounting type DIN EN 50022. The wiring connections are on the terminal strip located on the bottom of the electronic control unit. It is recommended to use cable sections of 1 to 2.5 mm 2, depending on their length, for power supply and solenoid connections. For other connections it is recommended to use cables with a screened sheath connected to earth only on the card side. NOTE 1 To observe EMC requirements it is important that the control unit electrical connection is in strict compliance with the wiring diagram of par. 7-8 - 9-10 of this catalogue. As a general rule, the valve and the electronic unit connection wires must be kept as far as possible from interference sources (e.g. power wires, electric motors, inverters and electrical switches). In environments that are critical from the electromagnetic interference point of view, a complete protection of the connection wires can be requested. 5 - START UP, CONTROL SETTINGS AND SIGNAL MEASUREMENT 5.1 - START UP AND CONTROL SETTINGS If required, settings can be adjusted as follows: - VERSION EPA-M1 ** a)offset CURRENT REGULATION Set GAIN A potentiometer to minimum. Enter reference signal at maximum value (+10V). Regulate the OFFSET A potentiometer so that the valve is positioned at the start of the working zone. b)scale FACTOR REGULATION Set the reference signal to the maximum value (+10V). Regulate the GAIN A potentiometer so that the controlled hydraulic parameter reaches the maximum required value. - VERSION EPA-M2 ** a) OFFSET CURRENT REGULATION Set GAIN A and GAIN B potentiometers to minimum. Enter reference signal at maximum value: +10V for solenoid A - 10V for solenoid B. Regulate the OFFSET A and OFFSET B potentiometers so that the valve is positioned at the start of the relative hydraulic configuration working zone. b) SCALE FACTOR REGULATION Enter the reference signal to the maximum value: +10V for solenoid A - 10V for solenoid B. Regulate the GAIN A and GAIN B potentiometers so that the controlled parameter in the relative hydraulic configuration reaches the maximum required value. - VERSION EPA-M3 ** a) OFFSET CURRENT REGULATION (Note:the same procedure applies to channels 1 and 2 on the card) Set GAIN A and GAIN B potentiometers to minimum. Enter reference signal at maximum value: +10V for solenoid of valve 1 + 10V for solenoid of valve 2. Regulate the OFFSET A and OFFSET B potentiometers so that the valve is positioned at the start of the relative hydraulic configuration working zone. b) SCALE FACTOR REGULATION (Note:the same procedure applies to channels 1 and 2 on the card) Enter reference signal at maximum value: +10V for solenoid of valve 1 + 10V for solenoid of valve 2. Regulate the GAIN A and GAIN B potentiometers so that the controlled parameter in the relative hydraulic configuration reaches the maximum required value. NOTE: The maximum current value must be compatible with the maximum current specified in the technical table of the relative proportional valve. - REGULATION FOR ALL VERSIONS: a) RAMP REGULATION Regulate the RAMP potentiometer to smooth valve response according to reference signal variations. NOTE: in the version EPA-M3** with two channels the ramp function is active only on channel 1. 5.2 - Signal measurement The EPA-TC/20 device (to be ordered separately) has the test points facilities for current and reference signal reading. This device has to be connected, by means of a flat cable, to the interface placed on the EPA card front side, behind the protecting gate. a) REFERENCE MEASUREMENT The test points REF.A and REF.B enable reading in voltage of reference signal sent to the EPA card. Reading is of opposite sign and divided by 4 as regards to the reference signal. Reading conversion is -1V (measured) = +4V (reference). At maximum reference value ± 10V reading may not be ± 2,5V but only ± 2,3V. This value is acceptable and is not to be considered a failure. b) CURRENT MEASUREMENT The test points I.A and I.B enable measurement in voltage of current supplied to solenoids A and B of the valve. Reading conversion is 0,5V =1A. NOTE: The points COM-R and COM-I must never be connected between themselves. 89 220/101 ED 4/8

5.3 - DEVICE FOR SIGNAL READING EPA-TC/20 (to be ordered separately) dimensions in mm REFERENCE channel 1 (EPA-M1 **, EPA- M3 ** ) solenoids A/B (EPA-M2 ** ) REFERENCE channel 2 (EPA-M3 ** ) Zero common reference reading CURRENT channel 1 (EPA-M1 **, EPA-M3 ** ) solenoid A (EPA-M2 ** ) Zero common current reading CURRENT channel 2 (EPA-M3 ** ) solenoid B (EPA-M2 ** ) NOTE: The points COM-R and COM-I must never be connected between themselves. 6 - DEFAULT CONDITIONS The electronic control unit is supplied factory-set. The standard settings are: REGULATIONS Card Ramp Gain A Gain B Offset A Offset B Switching Limit A Limit B identification [ma] [ma] [ma] [ma] [Hz] [ma] [ma] code note 1 note 1 note 2 note 2 EPA-M110 800 - - 200 800 - EPA-M111 800 - - 100 800 - EPA-M114 800 - - 400 800 - EPA-M120 1200 - - 200 1200 - REGULATION AT MINIMUM JP2 JUMPER OPEN EPA-M130 1600 - - 200 1600 - EPA-M210 800 800 200 800 800 EPA-M211 800 800 100 800 800 EPA-M220 1200 1200 200 1200 1200 EPA-M221 1200 1200 100 1200 1200 EPA-M230 1600 1600 200 1600 1600 EPA-M310 800 800 200 800 800 EPA-M311 800 800 100 800 800 EPA-M3210 1200 800 200 1200 800 REGULATION AT MINIMUM REGULATION AT MINIMUM NOTE 1: Values set with a maximum reference signal NOTE 2: Maximum current values supplied by the card. The potentiometer setting can not be adjusted by the user. 89 220/101 ED 5/8

7 - CARD CIRCUIT AND WIRING DIAGRAM EPA-M1 ** NOTE: See par. 10 for the correct wiring of the reference signal Terminal 15 must always be connected to earth. 8 - CARD CIRCUIT AND WIRING DIAGRAM EPA-M2 ** NOTE: See par. 10 for the correct wiring of the reference signal Terminal 15 must always be connected to earth. 89 220/101 ED 6/8

9 - CARD CIRCUIT AND WIRING DIAGRAM EPA-M3 ** NOTE: See par. 10 for the correct wiring of the reference signal Terminal 15 must always be connected to earth. 10 - WIRING DIAGRAM FOR REFERENCE SIGNALS EPA-M1 ** EPA-M2 ** EPA-M3 ** NOTE: If the generator has a differential output (not connected to ground) the pin 8 (and 11 for EPA-M3 ** version) must be connected to pin 14 (0V). 89 220/101 ED 7/8

10 - OVERALL AND MOUNTING DIMENSIONS dimensions in mm 13 - WITH TERMINAL BLOCK ON FRONT PANEL RAMP Ramp time single turn regulation 1 2 Regulation potentiometers and EPA-TC/20 connection interface side Potentiometer protecting gate Interface for signal reading device EPA-TC/20 GAIN A Scale factor multi-turn regulation Solenoid A OFFSET A Offset current multi-turn regulation Solenoid A GAIN B Scale factor multi-turn regulation Solenoid B 3 4 5 6 Green led signalling the card power supply Plugging-in 15-pole terminal strip with low cable output Screen printing with card circuit and wiring diagram Connection for rails type DIN EN 50022 Disabled potentiometers for the version EPA-M1 Terminal block OFFSET B Offset current multi-turn regulation Solenoid B SWITCHING PWM frequency regulation Single turn potentiometer with sealed setting. It can t be adjusted by the user } LIMIT A max current LIMIT B limit (it depends on the card versions) Single turn potentiometers with sealed setting. They can not be modified by the user Power supply signal GREEN LED ON: connected card GREEN LED OFF: disconnected card DUPLOMATIC OLEODINAMICA SpA 20025 LEGNANO (MI) - P.le Bozzi, 1 / Via Edison Tel. 0331/472111-472236 - Fax 0331/548328 89 220/101 ED REPRODUCTION IS FORBIDDEN. THE COMPANY RESERVES THE RIGHT TO APPLY ANY MODIFICATIONS. 8/8